Subspace based system identification for an acoustic enclosure

This paper is aimed at identifying a dynamical model of an acoustic enclosure, a duct with rectangular cross section, closed ends, and side mounted speaker enclosures. Acoustic enclosures are known to be resonant systems of high order. In order to design a high performance feedback controller for a duct or an acoustic enclosure; one needs to have an accurate model of the system. Subspace based system identification techniques have proven to be an efficient means for identifying dynamics of high order highly resonant systems such as flexible structures. In this paper a frequency domain subspace based method together with a second iterative optimization step minimizing a frequency domain least-squares criterion is successfully employed